ludic/docs/language/text/text-contains.md
Orkuncakilkaya b7745a4600 refactor(lang): rename the str type (and stringify builtin) to string
Expand the abbreviated string type and its conversion builtin to the full
word everywhere:
  str            ->  string        (the immutable-string type)
  str(x) -> str  ->  string(x) -> string   (the stringify builtin;
                                            what `{…}` interpolation calls)

Types are recognized by identifier, and llty maps both spellings to LLVM
`ptr`, so this is an atomic source rewrite: type annotations, the Ludic
type tags, the builtin name/dispatch, and the interpolation desugar, plus
the grammars, LSP, docs (type-str -> type-string, fn-str -> fn-string), and
inventory. int/bool stay (universally accepted, like Math).

Reseeded; C-free fixpoint holds; all suites green (45/24/29); site + check.py OK.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
2026-08-30 01:51:11 +03:00

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Markdown

---
id: text-contains
name: Text.contains
category: text
kind: namespace-method
tokens: Text.contains
sig: Text.contains(s, sub) -> bool
tip: Whether a substring appears anywhere in a string.
order: 5
ns: Text
member: contains
---
Returns <code>true</code> when <code>sub</code> occurs anywhere inside <code>s</code>. An empty substring is always considered present. Use it for a quick membership test — filtering a log line, checking for a forbidden word, or seeing whether a path includes a folder — when you do not need the position. Reach for <code>Text.index_of</code> when you also want where it matched.
Parameters:
- `s` — the string to search
- `sub` — the substring to look for
```ludic
program Filter {
var line: string = "error: disk full"
handler Scan phase Update {
if Text.contains(line, "error") {
# flag it
}
}
}
```